How do you request MANAGE_EXTERNAL_STORAGE permission in Android?

In Kotlin:

    val uri = Uri.parse("package:${BuildConfig.APPLICATION_ID}")

    startActivity(
      Intent(
        Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION,
        uri
      )
    )

(from this sample project)

You are probably used to an implicit Intent. The docs are asking you to use an explicit Intent, one with an action string and, in this case, a Uri. The Uri will have the package scheme and identify your app by its application ID.

That code snippet will start a system-supplied activity that, in theory, will let the user opt into granting your app the MANAGE_EXTERNAL_STORAGE permission.

If Uri will be used in Intent, Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION can be used instead of Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION.

if(SDK_INT >= 30){
if(!Environment.isExternalStorageManager()){
    Snackbar.make(findViewById(android.R.id.content), "Permission needed!", Snackbar.LENGTH_INDEFINITE)
            .setAction("Settings", new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    try {
                        Uri uri = Uri.parse("package:" + BuildConfig.APPLICATION_ID);
                        Intent intent = new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION, uri);
                        startActivity(intent);
                    } catch (Exception ex){
                        Intent intent = new Intent();
                        intent.setAction(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
                        startActivity(intent);
                    }
                }
            })
            .show();
}

}

You can create an intent like this :

Intent intent = new Intent(ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION, Uri.parse("package:" + BuildConfig.APPLICATION_ID));

Now, you can launch this intent with startActivityForResult.

final static int APP_STORAGE_ACCESS_REQUEST_CODE = 501; // Any value
startActivityForResult(intent, APP_STORAGE_ACCESS_REQUEST_CODE);    

In your onActivityResult method, you can check whether the user granted you the permission or not.

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == RESULT_OK && requestCode == APP_STORAGE_ACCESS_REQUEST_CODE)
    {
        if (Environment.isExternalStorageManager())
        {
            // Permission granted. Now resume your workflow.
        }

    }
}

You can also do this with the new ActivityResultAPI by launching the activity with :

// Initialize the variable in before activity creation is complete.
val storagePermissionResultLauncher = registerForActivityResult(StartActivityForResult(),
            ActivityResultCallback<ActivityResult?> {
                if (Environment.isExternalStorageManager())
                {
                    // Permission granted. Now resume your workflow.
                }
            })
// launch the above intent.
storagePermissionResultLauncher.launch(intent)

Also, make sure that you add this permission entry in your AndroidManifest.xml.

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" tools:ignore="ScopedStorage" />

1 Did you add uses-permission in the AndroidManifest.xml? like :

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

2 You can refer this github library: https://github.com/getActivity/XXPermissions
It wraped the api of google sdk, and provide a simple way to apply the permissions.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
    if (!Environment.isExternalStorageManager()) {
        try {
            var intent = Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION,
                    Uri.parse("package:" + packageName))
            startActivityForResult(intent, REQUEST_PERMISSION)
        } catch (e: Exception) {
            Logger.d(TAG, e.message)
            var intent = Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION)
            startActivityForResult(intent, REQUEST_PERMISSION)
        }
    }
}

Note: ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION and ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION are different.
Both of them can direct user to system settings page. The difference is

ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION, with this action, direct user to the package ("package:<package-name>") setting page.

ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION , this action direct user to app list. All apps which want to manage all files will show in that list.